I have created an application that is split into two parts; the left is the frame which has sliders that I want the values to be used to modify the right panel.
Here is the code:
import wx
import numpy
import matplotlib
import random
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
import Image
import ImageEnhance
#from wx.lib.pubsub import pub
class Main(wx.Frame):
def __init__(self, title):
wx.Frame.__init__(self, None, title=title, size=(1200,800))
self.sp = wx.SplitterWindow(self)
self.varPanel = wx.Panel(self.sp, style=wx.RAISED_BORDER)
self.imgPanel = ImgPanel(self.sp)
self.sp.SplitVertically(self.varPanel,self.imgPanel,300)
self.conSlider = wx.Slider(self.varPanel, -1, 0, 1, 10, pos=(10,10), size=(250,-1), style=wx.SL_AUTOTICKS | wx.SL_LABELS)
self.Bind(wx.EVT_SLIDER, self.sliderUpdate)
self.Show(True)
def sliderUpdate(self, event):
self.conValue = self.conSlider.GetValue()
#print "Contrast: ", self.conValue
return self.conValue
#pub.sendMessage("panelListener", message=self.conValue)
class ImgPanel(wx.Panel):
def __init__(self, parent):
wx.Panel.__init__(self, parent,-1,size=(50,50))
#pub.subscribe(self.myListener, "panelListener")
self.sizer = wx.BoxSizer(wx.VERTICAL)
self.SetSizer(self.sizer)
self.fig = plt.figure()
self.axes = self.fig.add_subplot(111)
self.canvas = FigureCanvas(self, -1, self.fig)
self.sizer.Add(self.canvas, 1, wx.LEFT | wx.TOP | wx.GROW)
self.drawImg()
'''def myListener(self, message, arg2=None):
"""
Listener function
"""
return message'''
def contrast(self, img, value):
enhancer = ImageEnhance.Contrast(img)
conImg = enhancer.enhance(value)
return conImg
def drawImg(self):
img = Image.open("d50.tif").convert("L")
#cIm = self.contrast(img, random.uniform(0, 3))
#cIm = self.contrast(img, message)
cIm = self.contrast(img, self.conValue) # how to get slider value??
arr = numpy.array(cIm)
im = plt.imshow(arr, cmap=plt.cm.gray)
if __name__ == '__main__':
app = wx.App()
frame = Main("Title")
app.MainLoop()
I want the value of my slider in the frame to be passed down to the drawImg() method in the panel. I was under the impression this was possible because the frame is parent to the panel. However, when run I get an attribute not found error for conValue.
I tried using messages as described here http://www.blog.pythonlibrary.org/2013/09/05/wxpython-2-9-and-the-newer-pubsub-api-a-simple-tutorial/ but without any luck (my code trying this has been commented out)
Please could someone help explain what I have done wrong and how I can use the slider variable in my panel.
-----Edit-----
New code based on Sundars help:
import wx
import numpy
import matplotlib
import random
from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg as FigureCanvas
import matplotlib.pyplot as plt
import matplotlib.image as mpimg
import Image
import ImageEnhance
#from wx.lib.pubsub import pub
class Main(wx.Frame):
def __init__(self, title):
wx.Frame.__init__(self, None, title=title, size=(1200,800))
self.conValue=''
self.sp = wx.SplitterWindow(self)
self.varPanel = wx.Panel(self.sp, style=wx.RAISED_BORDER)
self.imgPanel = ImgPanel(self, self.sp)
self.sp.SplitVertically(self.varPanel,self.imgPanel,300)
self.conSlider = wx.Slider(self.varPanel, -1, 0, 1, 10, pos=(10,10), size=(250,-1), style=wx.SL_AUTOTICKS | wx.SL_LABELS)
self.Bind(wx.EVT_SLIDER, self.sliderUpdate)
self.Show(True)
self.conValue = ""
def sliderUpdate(self, event):
self.conValue = self.conSlider.GetValue()
#print "Contrast: ", self.conValue
return self.conValue
#pub.sendMessage("panelListener", message=self.conValue)
class ImgPanel(wx.Panel):
def __init__(self, frameclass, parent):
wx.Panel.__init__(self, parent,-1,size=(50,50))
self.frameclass=frameclass
#pub.subscribe(self.myListener, "panelListener")
self.sizer = wx.BoxSizer(wx.VERTICAL)
self.SetSizer(self.sizer)
self.fig = plt.figure()
self.axes = self.fig.add_subplot(111)
self.canvas = FigureCanvas(self, -1, self.fig)
self.sizer.Add(self.canvas, 1, wx.LEFT | wx.TOP | wx.GROW)
self.drawImg()
'''def myListener(self, message, arg2=None):
"""
Listener function
"""
return message'''
def contrast(self, img, value):
'''
Method to alter the contrast of an image.
A factor of 0.0 gives a solid grey image. A factor of 1.0 gives the original image.
Returns the altered image.
'''
enhancer = ImageEnhance.Contrast(img)
conImg = enhancer.enhance(value)
return conImg
def drawImg(self):
img = Image.open("d50.tif").convert("L")
#cIm = self.contrast(img, random.uniform(0, 3)) # contrast change
#cIm = self.contrast(img, message)
cIm = self.contrast(img, self.frameclass.conValue)
arr = numpy.array(cIm)
im = plt.imshow(arr, cmap=plt.cm.gray)
if __name__ == '__main__':
app = wx.App()
frame = Main("Title")
app.MainLoop()
I am now receiving this error:
Traceback (most recent call last):
File "C:\Users\Nathan\Documents\Visual Studio 2013\Projects\VSEM\VSEM\module2.
py", line 78, in <module>
frame = Main("Title")
File "C:\Users\Nathan\Documents\Visual Studio 2013\Projects\VSEM\VSEM\module2.
py", line 21, in __init__
self.imgPanel = ImgPanel(self, self.sp)
File "C:\Users\Nathan\Documents\Visual Studio 2013\Projects\VSEM\VSEM\module2.
py", line 47, in __init__
self.drawImg()
File "C:\Users\Nathan\Documents\Visual Studio 2013\Projects\VSEM\VSEM\module2.
py", line 71, in drawImg
cIm = self.contrast(img, self.frameclass.conValue)
File "C:\Users\Nathan\Documents\Visual Studio 2013\Projects\VSEM\VSEM\module2.
py", line 62, in contrast
conImg = enhancer.enhance(value)
File "C:\Anaconda\lib\site-packages\PIL\ImageEnhance.py", line 36, in enhance
return Image.blend(self.degenerate, self.image, factor)
File "C:\Anaconda\lib\site-packages\PIL\Image.py", line 2008, in blend
return im1._new(core.blend(im1.im, im2.im, alpha))
TypeError: a float is required
Press any key to continue . . .
first thing :
in Frame class inside init create the variable
self.conValue=''
next,while calling imagepanel pass the Frame class also
self.imgPanel = ImgPanel(self,self.sp)
next inside init of image class
class ImgPanel(wx.Panel):
def __init__(self,frameclass, parent):
self.frameclass=frameclass
now,you can call it as
cIm = self.contrast(img, self.frameclass.conValue)